Chapter 12 - Objects in Motion

physical_science

Unit F - Motion, Work, and Machines

Chapter 12 - Objects in Motion

Discover more about how forces and motions shape the universe.

Classroom Activity

Weightlessness on Earth?

Who said daydreams are a waste of time? One of Einstein's flights of fancy led to the equivalence principle—the knowledge that while an object is in free fall, it's free of gravity's effects.

Space Shuttle Orbiter

Curriculum Materials

Space Shuttle Orbiter

Did you know that satellites and the Space Shuttle don't need engines to power their orbits? See how Earth's gravitational pull bends their forward motion and keeps them moving around the planet.

Case Study: John Michell And Black Holes

Online Resource, Article

Case Study: John Michell And Black Holes

Imagine gravity so strong that even light is contained by its force. When a country parson first described black holes in 1783, the concept was so ahead of its time that it was mostly ignored.

Gravity: It's Universal

Online Resource

Gravity: It's Universal

We owe our lives to gravity. It holds the atmosphere to Earth and keeps us all from falling off into space. Not to mention that without gravity, the stars and planets—including Earth—wouldn't even exist!